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panic: print backtrace on panic

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Panics currently lack backtraces, which are a very useful thing to
have. Make the profiling backtrace function generic and print backtraces
using it.
This commit is contained in:
Matheus
2026-10-08 22:14:46 -03:00
parent 9b8c81a2cf
commit 91ec85d8ca
4 changed files with 99 additions and 24 deletions
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kernel-src/arch/x86-64/arch_prof.c
+12 -24
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@@ -68,39 +68,27 @@ static void init_intel_pmc(void) {
arch_apic_init_perf();
}
static uint8_t get_backtrace(context_t *context, uintptr_t *data) {
if (IS_USER_ADDRESS(context->rip))
return 0;
static bool backtrace_fn(void *context, void *ip) {
uint8_t *data = context;
data[0] = context->rip;
if (data[0] == 255)
return false;
uint64_t *rbp = (uint64_t *)context->rbp;
uint8_t done = 1;
uintptr_t *trace = (uintptr_t *)&data[1];
trace[data[0]] = (uintptr_t)ip;
data[0] += 1;
for (;;) {
if (IS_USER_ADDRESS(rbp) || done == 255)
break;
uint64_t rip = *(rbp + 1);
if (IS_USER_ADDRESS(rip))
break;
data[done++] = rip - 1;
rbp = (uint64_t *)*rbp;
}
return done;
return true;
}
static bool intel_irq(context_t *context) {
if ((rdmsr(MSR_PERF_GLOBAL_STATUS) & INTEL_TSC_INDEX_OFFSET) == 0)
return false;
uint8_t data[1 + sizeof(uintptr_t) * 256];
uint8_t size = get_backtrace(context, (uintptr_t *)(data + 1));
*data = size;
profiling_insert(size, data);
uint8_t data[1 + sizeof(uintptr_t) * 255];
data[0] = 0;
arch_get_backtrace(context, backtrace_fn, data);
profiling_insert(data[0], data);
arch_apic_init_perf(); // SDM LVT figure says a PMC irq masks itself, so unmask it
reset_intel_pmc();